The correct option is None of the statements (a), (b) and (c) is correct in this context.
Explanation
The passage explicitly identifies the reasons for human-caused introductions of exotic species into new geographical areas. According to the passage, human-caused introductions may occur in the following ways:
- Accidentally — as a consequence of human transport, without deliberate intent.
- Intentionally but illegally — to serve some private purpose.
- Legitimately — to procure some hoped-for public benefit, such as:
- Bringing a pest under control (biological control),
- Producing new agricultural products, or
- Providing novel recreational opportunities.
The passage thus presents a tripartite framework of reasons — accidental, intentional-illegal, and intentional-legitimate — for human-mediated introductions. Since the question states that the correct answer is that none of the individual statements (a), (b), and (c) is correct in this context, it follows that each of those options presented only a partial or inaccurate representation of the passage's explanation, failing to capture the complete and precise reasoning as stated therein.
The passage does not attribute exotic species introduction solely to any single motive. Any option that isolates only one reason — whether accidental transport, private interest, or public benefit — as the explanation for why humans introduce exotic species would be incomplete and therefore incorrect as a standalone answer based strictly on the passage.
Key Takeaway: According to the passage, human introduction of exotic species occurs through three distinct pathways — accidental (via transport), intentional-illegal (private purpose), and intentional-legal (public benefit such as pest control, agriculture, or recreation); no single motive alone correctly captures the full explanation provided in the passage.